Man admits killing friend at Sydney party

A man on trial for stabbing his friend in the back at a Sydney party has pleaded guilty to murder.

In the ninth day of his NSW Supreme Court trial, Anthony Jones, 26, on Tuesday pleaded guilty to murdering 32-year-old Edan Brown at a party in Dee Why, in Sydney's northern beaches, on May 23, 2010.

Jones was being retried for the murder after a jury was unable to reach a verdict in the first trial.

The latest trial, which got under way on October 3, heard Mr Brown identified Jones as his attacker, telling paramedics during a triple zero call, "Anthony Jones stabbed me. Help me. I'm going to die soon."

The court heard Mr Brown was friends with Jones, who invited him to the party that night.

But in the early hours of the morning, a brawl broke out between Mr Brown and several men, including Jones, crown prosecutor Brad Hughes, SC, said in his opening submissions.

"It is the crown's contention that the accused, Anthony Jones, deliberately stabbed Edan Brown twice in his back, at least once while he was on the ground," Mr Hughes said.